Eben Goodale teaches at Guangxi University in China and is a field ornithologist who has studied mixed-species bird flocks in South and East Asia and Melanesia. Originally an animal behaviourist, his studies on interactions between species in flocks have led him into issues of community ecology and conservation biology, and he has published more than 20 peer-reviewed articles specifically on mixed groups.Guy Beauchamp is a behavioural ecologist specializing on social foraging in birds. He has written over 100 articles in peer-reviewed journals. He has been studying sandpipers for the last 10 years. He currently works as a research officer at the Veterinary College of the University of Montreal, Quebec, Canada.Graeme Ruxton has worked on animal behaviour for approximately 30 years, and authored more than 300 papers on the subject; group living has been a particular focus throughout that time, and he is joint author of the 2002 monograph "Living in Groups, which is still widely cited.